Python Abstract Class with Concrete Subclasses

from abc import ABC, abstractmethod

class Shape(ABC):
    @abstractmethod
    def area(self):
        pass

    @abstractmethod
    def perimeter(self):
        pass

class Rectangle(Shape):
    def __init__(self, width, height):
        self.width = width
        self.height = height

    def area(self):
        return self.width * self.height

    def perimeter(self):
        return 2 * (self.width + self.height)

class Circle(Shape):
    def __init__(self, radius):
        self.radius = radius

    def area(self):
        return 3.14159 * self.radius ** 2

    def perimeter(self):
        return 2 * 3.14159 * self.radius

if __name__ == "__main__":
    rect = Rectangle(5, 3)
    print(f"Rectangle area: {rect.area()}")
    print(f"Rectangle perimeter: {rect.perimeter()}")

    circle = Circle(4)
    print(f"Circle area: {circle.area():.2f}")
    print(f"Circle perimeter: {circle.perimeter():.2f}")